"This article explains how to migrate email accounts/mailboxes
from a sendmail server to a Qmail server. A challenging task for
any sysadmin implementing a Migration would be to migrate all the
email accounts from one Mail server to another preserving all the
settings, such as usernames and passwords.
"This document helps you, only if your Qmail system is installed
with VpopMail (not VmailMgr). Installing and configuring
qmail+vpopmail is out of the scope of this article..."